According to Merriam Webster, the primary pronunciation is "nich"...
http://www.merriam-webster.com/dictionary/niche
Just because a word has a French origin, doesn't mean the French pronunciation is preferred in English.
http://www.merriam-webster.com/dictionary/niche
Just because a word has a French origin, doesn't mean the French pronunciation is preferred in English.
Source: http://www.talktalk.co.uk/reference/dictionaries/english/dat...